Resistive evaluation of the coupling factor of an electromagnetic transponder
First Claim
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1. A method for evaluating a current coupling factor between an electromagnetic transponder and a terminal, comprising:
- obtaining data, representative of a voltage across an oscillating circuit of the transponder for two values of a resistive load, andcomparing a ratio with one or several thresholds, wherein the ratio is between the data representative of the voltage across the oscillating circuit for the two values of the resistive load.
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Abstract
A method for evaluating the current coupling factor between an electromagnetic transponder and a terminal, wherein a ratio between data, representative of a voltage across an oscillating circuit of the transponder and obtained for two values of the resistive load, is compared with one or several thresholds.
16 Citations
32 Claims
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1. A method for evaluating a current coupling factor between an electromagnetic transponder and a terminal, comprising:
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obtaining data, representative of a voltage across an oscillating circuit of the transponder for two values of a resistive load, and comparing a ratio with one or several thresholds, wherein the ratio is between the data representative of the voltage across the oscillating circuit for the two values of the resistive load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electronic system comprising:
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a transponder; and a terminal, wherein the transponder includes; an oscillating circuit, upstream of a rectifying circuit capable of providing a D.C. voltage when the transponder is present in a magnetic field of the terminal, and at least one processing unit configured to obtain data representative of a voltage across the oscillating circuit for two values of a resistive load, and to compare a ratio with one or several thresholds, the ratio being between the data representative of the voltage across the oscillating circuit for the two values of the resistive load, and wherein the terminal includes an oscillator configured to generate the magnetic field.
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14. A method comprising:
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obtaining data representative of first and second levels of a voltage across an oscillating circuit of a transponder for respective first and second values of a resistive load and for a tuned configuration of the oscillating circuit, and evaluating a coupling between the transponder and a terminal based on the obtained data. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A transponder comprising:
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an oscillating circuit configured to provide a signal in response to a magnetic field of a terminal; a rectifying circuit configured to rectify a voltage of a signal provided by the oscillating circuit; one or more circuits configured to form a resistive load; and at least one processing unit configured to; obtain data representative of first and second levels of a voltage across the oscillating circuit for respective first and second values of the resistive load and for a tuned configuration of the oscillating circuit, and evaluate a coupling between the transponder and the terminal based on the obtained data. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. An electronic system comprising:
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a transponder; and a terminal, wherein the transponder includes; an oscillating circuit configured to provide a signal in response to a magnetic field of a terminal, a rectifying circuit configured to rectify of a voltage of a signal provided by the oscillating circuit, one or more circuits configured to form a resistive load, and at least one processing unit configured to obtain data representative of first and second levels of a voltage across the oscillating circuit for respective first and second values of the resistive load and for a tuned configuration of the oscillating circuit, and to evaluate a coupling between the transponder and the terminal based on the obtained data, and wherein the terminal includes an oscillator configured to generate the magnetic field.
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31. A transponder comprising:
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an oscillating circuit configured to provide a signal in response to a magnetic field of a terminal; a rectifying circuit configured to rectify of a voltage of a signal provided by the oscillating circuit; one or more circuits configured to form a resistive load; and means for determining a coupling between the transponder and the terminal, wherein determining the coupling includes;
obtaining data, representative of a voltage across the oscillating circuit for two values of the resistive load, and comparing a ratio with one or several thresholds, the ratio being between the data representative of the voltage across the oscillating circuit for the two values of the resistive load.
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32. A transponder comprising:
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an oscillating circuit configured to provide a signal in response to a magnetic field of a terminal; a rectifying circuit configured to rectify of a voltage of a signal provided by the oscillating circuit; one or more circuits configured to form a resistive load; and means for determining a coupling between the transponder and the terminal, wherein determining the coupling includes;
obtaining data representative of first and second levels of a voltage across the oscillating circuit for respective first and second values of the resistive load and for a tuned configuration of the oscillating circuit, and evaluating the coupling based on the obtained data.
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Specification